As a follow up, my codes are gone and the car is running well while driving, but I still have rough idle and running rich. I discovered that the vacuum supply line to the vacuum solenoid (switchover valve) is broken so I do not have any EGR function. I ran a vacuum line to the EGR valve directly from the intake port that would normally operate the valve, and the idle actually decreases but still runs rich and poor.

I plan to replace the vacuum to the valve correctly, test it to make sure it's functioning, and test the EGR valve with a vacuum pump to make sure it's functioning (I really hope it is, because these are no longer made, and the ones I do find are extremely expensive). Then I'll smoke test the engine to find out where any other vacuum leaks are. At this point I'm convinced it's either a vacuum leak, the purge valve or something with the ECM.

As for your suggestions, the firing order is correct and the car runs buttery smooth while driving. I replaced the cap, rotor, plugs, wires, coil, cam advance solenoid, and air temperature sensor. It has plenty of power and everything else seems to be working correctly. It's just the idle and richness that is the problem now. Once this is fixed I'm good to go for a while I hope! It's a great car and perfect as a backup for the family vehicle. Love it so far but this idle thing is driving me nuts.